Platform-lever mechanism.



F. H. BUUKINGHAM.

PLATFORM LEVER MECHANISM.

APPLICATION FILED JULY 23, 1910. 993, 22, Patented May 30, 1911.

4 SEEBTSSEEET 1.

Sum/Mom Maw 3% alien's-L F. IL BUCKINGHAM.

PLATFORM LEVER MECHANISM.

APPLICATION FILED JULY 23, 1910 Patented May 30, 1911.

4 SHEETSSHEET 2.

P. H. BUCKINGHAM.

PLATFORM LEVER MECHANISM.

APPLICATION FILED JULY 23, 1910.

Patented May 30, 1911.

P. H. BUCKINGHAM. PLATFORM LEVER MECHANISM;

APPLIUATION FILED JULY 23, 1910 r 993,822 Patented May 3%, $3.1.

' 4 SHEETQ-SHEB'E. 4.

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n'rirrnn smm srsm FREMONT H. BUCKINGHAM,'OF DETROIT, MICHIGAN, ASSIGHUR T STAHDARD $0M- PUTING SCALE COMPANY, LIMITED, OF DETRGILT, MICHIGAN, A LIMITED sen..-

NERSEIF.

PLATFORM-LEVER MEGHAN'ISM.

Specification of Letters Patent. Patantetl Hwy 30, 1913.,

Application filed July 23,1910. Serial No. 73A22. v

To @113 wh m it may concern:

Be it known that I, Fnnivron'r H. BuoK- INGHAM. a citizen of the Unlted States, and

.a resident of Detroit, in the county of Wayne and State ofMichigen, have invented a. new and useful Platform-Lever Mechanism, of which the follow ng a. specification.

The main scele-lever end its supports, which form the principal subjectunatter of this invention, are so constructed that their onerstive connection may be changed, and

- is a. vertical section of the scale on the line 11'of Fig. 2. Fig. 2 is a bottom plan of the scale base and the mechanism therein. Fig. 3 is a portion of the some on a larger scale. Fig. 4 is a cross section on the line 4 -4 of Fig. 3'. Fig. 5 is a plan of the base sensitive in practically the same degree as the two arms of the mcin lever'approach equality of length. Articles which have a low price per pound are usually sold in larger quantities at retail than. such as hav a high value. Thedrawings of this application show a. computing scale of the pendu lnm type so constructed that smaller uantities may be Weighed by means of mec nnism of less-leverage'than when larger quantities are on the platform. This is accomplished by providing the main level 'With' a plurality of fulcra, so positioned, that the leverage may increased or decreased.

...Wh1le any desired type'df weight indi- Yceting and weight resisting mechanism may be" employedytheliifshown the former Buckingham Patent No. 939,213, dated Nov.

9, 1909, has been indicated in Fig. 6. The greduations may denote any desired sums or amounts, depending on the character of the goods weighed,-but will preferably be in double lines, one line of each pair for each position of the leverage-controlling device.

The base 1 may be of any desired form and height. Above it is mounted the case 2 of the indicating mechanism, the front of the case being omitted in Fig. 6. A platform 3, of any desired material, preferably glass, rests on the ellipticslplatform frame 4, having feet 5. The various refinements of the-scale-mskers art may be employed, such as adjustable agate bearings and adjustable knife-edges of hard steel, wherever necessary, but these details will not be mentioned hereafter.

Projecting upward. from the upper plate 5 of the base are the pedestals 7 which sup port the knife-edges 8 of the secondary,

lever 9. The rear feet 5 of the frame i rests on the outer knife-edges 10 of this lever. At the inner end of this lever is a forked neck having two upwardly turned knife-edges 13, which enter the openings '11 in the link 12, (Figs. 1]. and I2) which has bearings for openings.

The front feet 5 of the frame 4; rest on the outer knife-edges 14 of the other secondary lever 15. On the opposite end, this lever has a neck provided with a knife-edge 16 which enters an opening in the upper end of the inner link' 1?. This inner link carries knife-edges 18 at its lower end which engage the bcarings'ltl' in the lower end of the link 12. See Figs. 11 and 12. The knife-edges these knife-edges at the upper part of these 20, which are the fulcrum of this lever 15 rest on yieldslole pedestals 23 which are connected by a bar 21.. Secured to the bottom of the plate 6 are stirrups 9A which carry the knife-edges 22. The pedestals 23 have upper and lower bearings, the former rewaiving the knife-edges 20 of the lever 1.5 and the lower bearings receiving the pivots 22. and 17 end the movable pedestals '23 accommodctes the angular movements of the'levers 9 end.15. The pedestals 23 may be guru-deal by the short tubes 25 which project upwsrdly fromthe plate 6. 4

,Ihe ma n lever of this scele is of the sec This combination of the two links 12 0nd order and the end which connects to the indicating mechanism moves upward es the load moves downward because the secondary levers are of the first order and cause the links 12 and 17 to move upward as the platform descends. Referring to Fig. 9, it will be seen that the lever is in the form of a grid having sides 30 and 31, forward arms 32 and 33, and cross bars 34. The pieces 35 and 36 are counterweights, which together with the main lever, balance the parts just described. The lever carries knife-edges 37 which rest in the hearings in the lugs 38 on the sides of the link 12.

The main lever has two independent fulcra formed by the knife-edges 40 and ll. At the outer end of the arm 33, is a knifeedge e2 to which the indicating mechanism is connected.

Brackets extend downward from the plate (5 and carry the shafts A controlling lever 47 is secured to the outer end of the controlling crank-shaft 4:8,which has n crank-pin 4:9 at its inner end. See Figs. 3 and 7 Secured to these shafts 46 are the crank-arms 50, 51, 52 end 53, which are provided with knife-edges and 55 which are adapted to engage the lower hearings 56 of the linlts 57 an. These links are duplicates and are shown in Figs. 3, l and 8. The upper bearings 59 are adapted to engage the fulcrum knife-edges l0 end 41 of the main lever. The crank-arms and 51 are connected by a link 60 and the arm 51 is connected to the crank-pin e9 by the link 61.

As shown in Fig. 7, one half revolution of the shaft 48 will swing-the crank-arms from the position shown in dotted lines to that in solid lines or back again. As the pull of the link 12 on the knife-edges 37 is upward; the thrust of the knife-edges 40 and all will be upward against the upper bearings 59 of the links 57 and 58, and these links will there'- fore pull upward against the knife-edges 54 and 55 respectively of the crank arms. The, weights of these links 57 and 58 are supported by the smell springs 6'3 secured to the crank-arms as shown in Figs. 3. and l. A bracket 67, connected to the link 12, carries one end or" the link 68, the other end of which is pivoted to the cross bar 69.niounted on the brackets 45. The lower ends of the links 12 and 17 are thereby kept from swinging out of line by a load on one side of the platform.

In the front end of the plate 6 (Fig. 6-)

a dash-pot may be mounted in the opening 65 and be provided with a cover 71. The rod 72 is connected to the piston 73 and to the yoke 7 which extends across between the arms 32 and 33 of the main lever.

Referring now to Fig. 6, it will be seen that the fan shaped dial 7 6 is provided with two series of graduations 77 and 78, besides lines for figures. An indicator 79 is provided with knifoedges' 80 which rest on the brackets 81. Connected to the indicator are the pendulum 82 and an arm 83 havinga knife-edge 84; A. thrust-rod 85 rests on the knife-edge 42, at the end of the main lever, and engages the link 86. This link engages the knife-edge 84 and its opposite end is guided by the connecting-rod 87. By this link-movement the indicator is caused to travel through substantially equal arcs 2 pressure of the load on the pivots 10 and 14 of these levers will cause an n ward pull on the links 12 and 17, thii kni e-edges 15% of the link 17 transferring'the pull of tliz: lever 9 to the link 12. Theupward stress 1;

transferred to the knife-edges 37 of tin:

main lever. When the parts are in the positions shown in Fig. 4 of the drawings, the arms 50 and 52 are depressed, thereby holding down the link 57 with its bearings All in engagement with the knife-edges 41 ut the outer end of the main lever. The line or the edges of these pivots defines the fulcrum of the main ley'e'r and the load-arm is the distance fromthis line to the line of the pivots 37, while the power-arm is from the same line to the knife-edge 4:2. This ratio may be as desired by properly pro ortion ing the lever arms, and is preferab y indicated by some character on the end of the controlling lever 47, 30 being shown in Fig. 5. If new this controlling lever 17 is swung forward one-half revolution, the creme-arms 50 and 52 will be elevated and the arms-5?. and 53 depressed, lifting the link 57 from the knife-edges l1 and lowering the link 58 onto the knife-edges 40., The line of the knife-edges 40 now constitutes the fulcruu. of the main lever, whose load-arm is the distance from this line to the line of the pivots 37, while the power-arm is from, the

same line to the knife-ed e 42. In swinging the operating-crank 47, t e character on the lower side (see Fig. 2) is brought to View. The levers in the drawin s are so proportioned that for equal load; on the v2:

platform, the indicator 79. will move three and one-third times farther when the character 30 i'svisible on the controlling lever 47 than when 100 is in view.

As stated before, the scale is more sensitive when the longer lever-a e is employed. The characters on the contrrfiling-lever may indicate certain limits in weight which can be determined, or of which the price can be computed when these numbers are in view.

ceases The user-will be instructed that graduation 7'7 will be used when the longer load-arm is employed and graduations 7 8 With the shorter. Similar instructions may be given I tion ms secure by Letters Patent is 1. In a scale, the combinationof a base, a lever, a plurality of .fulcra for the lover, a plurality of bearings mounted on the base, one for each fulcrum, a load-resisting device connected to said lever, and a load-receiving device connected to the lever between said fulcra and theload-resisting device.

2; In a scale, the combination of a base, a

.main lover of the second order,a plurality of fulcrtmi pivots on the lever, a bearing mounted on the base for each fulcrum pivot, a load-resisting device connected to one end of said lever, and a load-receiving device connected to said lever intermediate its ends.

3. Ina scale, a main lever of the second order, a pluralit of fulcrum pivots on the lever, movable earings adapted to press down on said fulcrum pivots, a load-resistingdevico adapted to be moved upward by one end'of said lever, and a load-receiving device connected to said lever intermediate said fulcra and the load-resisting device and pulling upward on the same. i. In a scale, the combination of a base, a main lever below the same and having a knife-edge at one end, load-resisting means connected thereto, links movably supported belovi 'said base, each adapted to engage said lever at a different distance from said knife edge, and a load-receivingdevice connecting to said lever intermediate its ends.

5. in a scale, the combination of a base, a main lever below the same, a pair of secondary levers,-a platform resting on the outer'ends of the secondary levers, pedestals for said levers, links connecting the inner ends of the secondary levers and the mainilsver' intermediate its ends, a load-resisting device connected to said main lever, and a plurality of fulcra for said main lever, adapted to be alternately employed for weighing.

6. In a scale, the combination of a platform, a plurality of bearing-links,pivots to engage the lower ends of said links alter nately, means to move the pivots of sand links in opposite directions, a main lever having a plurality of sets of pivots, oneset in line with each link, a load-receiving device, means to connect the same "tosaid lever, a load-resisting device, and means to connect the same to the lever on the opposite side of said load-receiving connection from the links.

7. in a scale, the combination of a platform, a pair of pedestals rigid therewith, a

second pair of pedestals yicldably mountedthereon, secondary levers mounted intermediate their ends on said pedestals, a loadreceiver engaging the outer ends of said levers, links connected at their lower ends engaging the inner ends of the levers, a main lever connected to said links intermediate its ends, a load-resisting device connected to one end of the mam lever, and bearings adapted alternately to engage pivots on the opposite end of the main lever.

.8, In a scale, a main lever oi the second order, a plurality of fulcrum pivots on the lever, bearings adapted to engage said fulcrum pivots, one for each pivot, verticall movable supports for said bearings, a loa resisting device connected to one end of said lever, and a load-receiving device connected to said lever intermediate its ends.

9, in a scale, a main lever of the second order, a plurality of fulcrum pivots on the lever, bearings adapted to press down on said fulcrum pivots, vertically movable supports for said bearings, a load-resisting device adapted to be moved upward by one end of said lever, and a load-receiving device connected to said lever, intermediate its ends and pulling upward on the same.

10. in a scale, the combination 01": a base, a main lever below the same and having a. knife-edge at one end, load-resisting means connected thereto, links niovably supported below said base, each adapted to engage said lever at a different distance from said knifeedge, crank-arms to engage the links at their lower ends, and a loadreceiving device connecting to said lever intermediate its ends.

11. in a scale, the combination of a base, a main lever of the second order below the same, a pairof'secondary lovers of the first order, a platform, resting on the outer ends of the secondary levers, pedestals for said levers, links connecting to the inner ends of the secondary levers and to the main lever intermediate its ends, a lcadresistihg device connected to said main leven'a plu ality of iulcra for said main lever to he alternately employed for weighing, and movable supporting means for said links,

12. In a scale, the combination of a plat form, a plurality of bcaring-links. pivots to engage the lower ends of said links alter nately, means to alternately raiseand lower said pivots, a main lever having a plurality of sets of pivots, one set in line with each link, a load-receiving device, secondar levers to support the same, links connecting the inner ends of the secondary leversto the main lever intermediate its ends, a load-rei in sisting' device, and means to connect the same to the lever on the op osite side of said loadreceiving connection rom the links.

13. In a scale, the combination of a platform, a pair oi pedestals rigid therewith, a

, second pair of pedestals yieldably mounted thereon, secondary levers mounted interlever, links having hearings in their pper ends, alternately to engage pivots on the opposite end of the main lever, and vertically movable supports engaging hearings in the lower ends of said links.

ls. In a scale, the combination of a base, brackets supported thereby, shafts supported in said brackets, crank-arms connected to said shafts and having pivots on their lower sides, a main levelmounted adJecent said crank-arms end having pivots above those on the crank-arms, a plurality of links having upper bearings in line with"the pivots on the lever and lower bearings in line with the pivots on the crank-arms, means to rock said shafts to bring the hearings of either link intooperative connectionwith the adj cent pivots'e load-indicating device, a load receiving device, and means for connecting the same to the main level.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

FREMONT H, BUCKlNGHAl/l. 

